Impact of Tb substitution on structural, electrical and magnetic properties of Ho1−xTbxFeO3 orthoferrite.

Autor: Chatla, Eadaiah, Vankudothu, Nagendar, Shravan Kumar Reddy, S., Shanmukharao Smatham, S., Sreenath Reddy, M., Gopal Reddy, Ch., Yadagiri Reddy, P.
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Zdroj: Applied Physics A: Materials Science & Processing; Jan2024, Vol. 130 Issue 1, p1-14, 14p
Abstrakt: Orthoferrite is a class of chemical compounds with the formula RFeO3, where R is one or more rare-earth elements. This paper reports, the structural, electrical, magnetic and 57Fe Mossbauer study of Terbium (Tb) doped Holmium Orthoferrite i.e., Ho1−xTbxFeO3 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1.0) samples, synthesized through sol–gel method. The samples are found to be phase pure. Room temperature Raman study reveals that the lower wave number modes are strongly affected compared to the higher wave number modes with Tb doping. Structural modifications with Tb doping in different proportions were explained in detail by correlating room temperature Raman and XRD results. FESEM analysis suggests noticeable increase in the porosity with the increase of Tb doing. The lossy P–E loops were the signature of enhanced porosity in doped samples as compared to the parent compound. Space charge limited conduction (SCLC) mechanism dominates the conduction as described from the obtained slope values of J–E curves. The magnetization of HoFeO3 (x = 0.0) shows two transitions around TSR1 = 52 K and TSR2 = 35 K. Tb substitution, has resulted in the complete diminution of TSR1 with a simultaneous effect on TSR2. Eventually, Tb substitution suppresses the spin orientation transitions of HoFeO3. A sharp magnetically split 57Fe Mossbauer sextet indicates the presence of magnetic ordering in these othroferrites. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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